Below are two chemical reactions . In the Sketchpad below, express these two chemical reactions as ONE Reversible Reaction

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Identify the missing numbers below to show the result of multiplying the numbers (1.6 × 10-19)(5.0 × 106) = c × 10d

Is a pencil falling to the floor anon contact force, a force, or a contact force